DESCRIPTION
WIRING DIAGRAM
INSPECTION PROCEDURE
CHECK HARNESS AND CONNECTOR (MILLIMETER WAVE RADAR SENSOR - DISTANCE CONTROL ECU)
CHECK DISTANCE CONTROL ECU (IGB VOLTAGE)
CHECK HARNESS AND CONNECTOR (MILLIMETER WAVE RADAR SENSOR - ECM AND BODY GROUND)
DYNAMIC RADAR CRUISE CONTROL SYSTEM - Millimeter Wave Radar Sensor Power Source Circuit
DESCRIPTION
This circuit provides power to the millimeter wave radar sensor. The millimeter wave radar sensor emits radio waves towards an object in front and measures the distance and direction of the object by receiving the wave reflections. Based on the reflections, the sensor calculates the difference in speed between the vehicle and the object in front. This data is transmitted to the distance control ECU.
WIRING DIAGRAM
INSPECTION PROCEDURE
- When the distance control ECU is replaced with a new one, initialization must be performed ().
| 1.CHECK HARNESS AND CONNECTOR (MILLIMETER WAVE RADAR SENSOR - DISTANCE CONTROL ECU) |
Disconnect the A56 millimeter wave radar sensor connector.
Disconnect the E108 distance control ECU connector.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
| Tester Connection | Condition | Specified Condition |
| A56-2 (SGND) - E108-10 (SGND) | Always | Below 1 Ω |
| A56-5 (IGB) - E108-13 (IGB) |
| E108-13 (IGB) - Body ground | Always | 10 kΩ or higher |
| A56-5 (IGB) - Body ground |
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
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| 2.CHECK DISTANCE CONTROL ECU (IGB VOLTAGE) |
Disconnect the A56 millimeter wave radar sensor connector.
Measure the voltage according to the value(s) in the table below.
- Standard Voltage:
| Tester Connection | Switch Condition | Specified Condition |
| A56-5 (IGB) - A56-2 (SGND) | Engine switch on (IG) | 11 to 14 V |
| | REPLACE DISTANCE CONTROL ECU ()
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| 3.CHECK HARNESS AND CONNECTOR (MILLIMETER WAVE RADAR SENSOR - ECM AND BODY GROUND) |
Disconnect the A56 millimeter wave radar sensor connector.
Disconnect the A38*1 or A52*2 ECM connector.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
for LHD| Tester Connection | Condition | Specified Condition |
| A56-1 (LGND) - A38-44 (LGND) | Always | Below 1 Ω |
| A56-1 (LGND) - Body ground | Always | 10 kΩ or higher |
for RHD| Tester Connection | Condition | Specified Condition |
| A56-1 (LGND) - A52-44 (LGND) | Always | Below 1 Ω |
| A56-1 (LGND) - Body ground | Always | 10 kΩ or higher |
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
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| OK | |
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| PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE ()
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